nptl: Correct stack size attribute when stack grows up [BZ #32574]

Set stack size attribute to the size of the mmap'd region only
when the size of the remaining stack space is less than the size
of the mmap'd region.

This was reversed.  As a result, the initial stack size was only
135168 bytes.  On architectures where the stack grows down, the
initial stack size is approximately 8384512 bytes with the default
rlimit settings.  The small main stack size on hppa broke
applications like ruby that check for stack overflows.

Signed-off-by: John David Anglin <dave.anglin@bell.net>

diff --git a/nptl/pthread_getattr_np.c b/nptl/pthread_getattr_np.c
index 1e91874767d894ef16b0bd62649a22990ca2eeae..3ce34437bca2ce5ec441268952d867ae6209178c 100644 (file)
--- a/nptl/pthread_getattr_np.c
+++ b/nptl/pthread_getattr_np.c
@@ -145,9 +145,9 @@ __pthread_getattr_np (pthread_t thread_id, pthread_attr_t *attr)
                          > (size_t) iattr->stackaddr - last_to)
                        iattr->stacksize = (size_t) iattr->stackaddr - last_to;
 #else
-                     /* The limit might be too high.  */
+                     /* The limit might be too low.  */
                      if ((size_t) iattr->stacksize
-                         > to - (size_t) iattr->stackaddr)
+                         < to - (size_t) iattr->stackaddr)
                        iattr->stacksize = to - (size_t) iattr->stackaddr;
 #endif
                      /* We succeed and no need to look further.  */